Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dffe92e9d9a901…

MALICIOUS

PDF

80.4 KB Created: 2021-03-23 01:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5b4cbf5425a183fab00662dad4e26814 SHA-1: 75eac0d6b8b68a17b8b0054aca5d0f892b9eb907 SHA-256: 97dffe92e9d9a901e642430283a42c50ef753b536c5dbceded84e20f88b75d1a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The document body is heavily obfuscated, but the presence of links and the heuristic firings point to a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/wix?keyword=temple+run+oz+apkmirror In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_6036a34a44890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452154/normal_6006120350c68.pdfIn PDF document text
    • http://megalit-korolev.ru/stihl_weed_eater_parts_canadaa6ltn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_6057a03aa912e.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/BH8G4ji/coastal_community_and_teachers_credit_union_lienholder_address.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492278/normal_6003182d76992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_6051ecd25450a.pdfIn PDF document text
    • http://artistichomesolutions.com/sig_sauer_p229_9mm_legionqmrbp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_60366ae1c64c2.pdfIn PDF document text
    • https://cdn.sqhk.co/gedofovel/hoj7Zhd/bizeladojefovuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/eTkTORw/63466545542.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/jiJ1Msa/gezovefamidub.pdfIn PDF document text
    • http://presentinsta.online/62877313456or170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_ee6e52990fc94eff817fadeb3bedfde0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/material_design_angularjs_template.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_0338da46ced44ec697f3542c31efd729.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/65951348515.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_116c99d7d5374b9f9741a54f74dec30e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zugutixe/30791645885.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011775.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11775 18224 bytes
SHA-256: 5545668a61ca47499a8fbd038ae337c48dfefa94f9b2f49c4b99a31578e78691
font_00_sfnt_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 4848 bytes
SHA-256: 240ea5ed13096186908e4775dac2a63cfe534e48d3c5b06101201bb90c814ff5
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 11012 bytes
SHA-256: bd4fc616d0297951abd0b4d14fc2a14e492f77acd48fea38394788a72a2a85e7

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